back up plan for technical

In terms of technical, I've finally found a software that able to link one computer by another computer.

For example, when user are watching video in computer B, someone will be controlling computer A.

Therefore, when user make decision, the person who controlling computer A will click on the button at the same time, so the video will jump to another video. 

So here I found this software name "Teamviewer".

TEAMVIEWER

link : http://www.teamviewer.com/en/index.aspx

I think this way is quite "cheating" but at least I have this back up plan if Im not able to work out with any more advance method. 

However there's a problem with this software. 

Basically, both computer's screens will be showing the same thing. 

Hence, if you're clicking the decision button from computer A, computer B would definitely see it. 

Then, I think of a solution for this, maybe I can create a box or wrap the computer as if it is not computer, it might be jus box or TV.

I will leave just a hole which same size as the video shown, buttons will place somewhere under the video and covered by the box. So when someone clicking the button, user wouldn't see it. 

This is my back up plan, using the easy way. ^^